Spa water is foamy and has an unpleasant odor, but no error codes are displayed.

Safety first: Avoid using the spa until water chemistry is corrected.

• Test water: Use Aquaterra-approved test strips or a liquid kit to check sanitizer, pH, and alkalinity.
• Shock treatment: Add a non-chlorine shock or chlorine shock according to label directions to oxidize contaminants.
• Adjust balance: Bring pH and alkalinity into the recommended range for Aquaterra Spas.
• Clean filter: Remove and thoroughly clean the filter cartridge. Replace if more than 1–2 years old.
• Drain and refill if needed: If foam and odor persist, drain the spa completely, clean the shell, and refill with fresh water.

Persistent water quality issues may require consultation with a pool/spa water specialist.